Solution

app/main.py

@@ -1,6 +1,37 @@
-def main():
-    # write your code here
-    pass
+def main() -> None:
+    file_name = get_file_name()
+
+    content = get_file_content()
+
+    create_file(file_name, content)
+
+
+def get_file_name() -> str:
+    """Get and validate file name."""
+    while True:
+        file_name = input("Enter name of the file: ").strip()
+        if file_name:  # Check not empty
+            return file_name
+
+
+def get_file_content() -> list:
+    """Get content line by line until 'stop'."""
+    content = []
+    while True:
+        line = input("Enter new line of content: ")
+        if line.strip().lower() == "stop":
+            break
+        content.append(line)
+    return content
+
+
+def create_file(file_name: str, content: list) -> bool:
+    """Create .txt file with content."""
+    full_name = f"{file_name}.txt"
+    with open(full_name, "w") as f:
+        for line in content:
+            f.write(line + "\n")
+    return True
 
 
 if __name__ == "__main__":